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The Gamma Ray Universe
Topic Started: May 23 2009, 07:46 AM (283 Views)
ngc1514
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The gamma-ray sky comes alive in a movie made from data acquired by NASA's Fermi Gamma-ray Space Telescope during its first three months of operations. Gamma rays from sources near and far turn the sky into a hypnotic froth. The sun arcs serenely across the northern sky as active galaxies called blazars flare up and fade out.

The movie, made from the first 87 days of data from Fermi's Large Area Telescope (LAT), was revealed on April 3, during webcast called "Around the World in 80 Telescopes." Organized by the European Southern Observatory headquartered in Garching, Germany, the webcast was part of the 100 Hours of Astronomy project, a worldwide celebration of astronomy running through April 5.

"The movie shows counts of gamma rays seen by Fermi's LAT, and each frame shows the gamma rays collected in one day," said presenter Elizabeth Hays, an astrophysicist on the Fermi team. Only gamma rays with energies greater than 300 million electron volts -- or 150 million times more than that of visible light -- are shown. Brighter colors indicate greater numbers of detected gamma rays and thus the locations of bright gamma-ray sources.

http://www.spaceref.com/news/viewpr.html?pid=28058
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